As voting gets underway in Afghanistan's second-ever presidential election, we talk Martin Patience, an Afghan correspondent for the BBC. Polling centers have opened across the country, but violence has already shuttered some voting spots. Martin is on the ground in Mazar-i-Sharif in Northern Afghanistan. The threat of violence is being taken extremely seriously; some 300,000 Afghan and foreign troops will be deployed to protect an estimated 17 million voters at 6,969 polling sites.

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